Darksmoke, stop. Just stop. You clearly are highly misinformed about domestic animals. Dogs were not created from mixed breeding of different canine families. They're wolves that evolved over the last several thousand years to be able to cohabitate with human populations readily. The early evolution was primarily accidental, and only later became purposeful. Most "breeds" are actually extremely modern... as in only a few centuries old. There are, of course, older 'breeds' out there, but the vast majority of purposefully made ones are recent.
Cats are obligate carnivores. That does NOT mean plants will kill them. Please don't actually be that naive to use such an obvious straw man argument. They would naturally consume the gut contents of their prey and thus have some contact with plant materials. However, unlike dogs, humans, and most other carnivorous or omnivorous animals, they cannot create certain needed amino acids out of other ones. Arachadonic acid and Taurine are found in those forms specifically in meat, not plants. Thus, a cat *needs* meat in order to survive, and needs significant quantities of it. This is what makes them an obligate carnivore. Their gut is also very short, showing their primarily meat-based diet. Humans and dogs, being more omnivorous, have intestines better adapted to dealing with a mix of vegetable and animal foodstuffs.